From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753305AbXCMQJs (ORCPT ); Tue, 13 Mar 2007 12:09:48 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1753306AbXCMQJr (ORCPT ); Tue, 13 Mar 2007 12:09:47 -0400 Received: from mail12.syd.optusnet.com.au ([211.29.132.193]:59452 "EHLO mail12.syd.optusnet.com.au" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753305AbXCMQJr (ORCPT ); Tue, 13 Mar 2007 12:09:47 -0400 From: Con Kolivas To: ck@vds.kolivas.org Subject: Re: [PATCH] [RSDL-0.30] sched: rsdl improve latencies with differential nice -1 Date: Wed, 14 Mar 2007 03:08:39 +1100 User-Agent: KMail/1.9.5 Cc: Al Boldi , Andrew Morton , linux-kernel@vger.kernel.org References: <200703042335.26785.a1426z@gawab.com> <200703140231.28314.kernel@kolivas.org> <200703140303.36456.kernel@kolivas.org> In-Reply-To: <200703140303.36456.kernel@kolivas.org> MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit Content-Disposition: inline Message-Id: <200703140308.40038.kernel@kolivas.org> Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org On Wednesday 14 March 2007 03:03, Con Kolivas wrote: > On Wednesday 14 March 2007 02:31, Con Kolivas wrote: > > On Monday 12 March 2007 22:26, Al Boldi wrote: > > > I think, it should be possible to spread this max expiration latency > > > across the rotation, should it not? > > > > Can you try the attached patch please Al and Mike? It "dithers" the > > priority bitmap which tends to fluctuate the latency a lot more but in a > > cyclical fashion. This tends to make the max latency bound to a smaller > > value and should make it possible to run -nice tasks without killing the > > latency of the non niced tasks. Eg you could possibly run X nice -10 at a > > guess like we used to in 2.4 days. It's not essential of course, but is a > > workaround for Mike's testcase. > > Oops, one tiny fix. This is a respin of the patch, sorry. A few other minor things would need to be updated before this patch is in a good enough shape to join the rsdl patches. This one will be good for testing though. -- -ck